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acpi: Support writing a name
ACPI supports storing names which are made up of multiple path components. Several special cases are supported. Add a function to emit a name. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
Bin Meng
parent
3df33bda5c
commit
7aed90d44c
4 changed files with 231 additions and 0 deletions
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@ -21,12 +21,15 @@ struct acpi_ctx;
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enum {
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ZERO_OP = 0x00,
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ONE_OP = 0x01,
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NAME_OP = 0x08,
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BYTE_PREFIX = 0x0a,
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WORD_PREFIX = 0x0b,
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DWORD_PREFIX = 0x0c,
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STRING_PREFIX = 0x0d,
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QWORD_PREFIX = 0x0e,
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PACKAGE_OP = 0x12,
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DUAL_NAME_PREFIX = 0x2e,
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MULTI_NAME_PREFIX = 0x2f,
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};
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/**
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@ -165,4 +168,26 @@ void acpigen_write_integer(struct acpi_ctx *ctx, u64 data);
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* @str: String to write
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*/
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void acpigen_write_string(struct acpi_ctx *ctx, const char *str);
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/**
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* acpigen_emit_namestring() - Emit an ACPI name
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*
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* This writes out an ACPI name or path in the required special format. It does
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* not add the NAME_OP prefix.
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*
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* @ctx: ACPI context pointer
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* @namepath: Name / path to emit
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*/
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void acpigen_emit_namestring(struct acpi_ctx *ctx, const char *namepath);
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/**
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* acpigen_write_name() - Write out an ACPI name
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*
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* This writes out an ACPI name or path in the required special format with a
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* NAME_OP prefix.
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*
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* @ctx: ACPI context pointer
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* @namepath: Name / path to emit
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*/
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void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath);
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#endif
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@ -134,6 +134,23 @@ int ut_check_console_dump(struct unit_test_state *uts, int total_bytes);
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} \
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}
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/*
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* Assert that two string expressions are equal, up to length of the
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* first
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*/
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#define ut_asserteq_strn(expr1, expr2) { \
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const char *_val1 = (expr1), *_val2 = (expr2); \
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int _len = strlen(_val1); \
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\
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if (memcmp(_val1, _val2, _len)) { \
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ut_failf(uts, __FILE__, __LINE__, __func__, \
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#expr1 " = " #expr2, \
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"Expected \"%.*s\", got \"%.*s\"", \
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_len, _val1, _len, _val2); \
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return CMD_RET_FAILURE; \
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} \
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}
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/* Assert that two memory areas are equal */
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#define ut_asserteq_mem(expr1, expr2, len) { \
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const u8 *_val1 = (u8 *)(expr1), *_val2 = (u8 *)(expr2); \
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@ -153,3 +153,99 @@ void acpigen_write_string(struct acpi_ctx *ctx, const char *str)
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acpigen_emit_byte(ctx, STRING_PREFIX);
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acpigen_emit_string(ctx, str);
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}
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/*
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* The naming conventions for ACPI namespace names are a bit tricky as
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* each element has to be 4 chars wide ("All names are a fixed 32 bits.")
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* and "By convention, when an ASL compiler pads a name shorter than 4
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* characters, it is done so with trailing underscores ('_')".
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*
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* Check sections 5.3, 20.2.2 and 20.4 of ACPI spec 6.3 for details.
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*/
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static void acpigen_emit_simple_namestring(struct acpi_ctx *ctx,
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const char *name)
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{
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const char *ptr;
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int i;
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for (i = 0, ptr = name; i < 4; i++) {
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if (!*ptr || *ptr == '.')
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acpigen_emit_byte(ctx, '_');
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else
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acpigen_emit_byte(ctx, *ptr++);
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}
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}
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static void acpigen_emit_double_namestring(struct acpi_ctx *ctx,
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const char *name, int dotpos)
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{
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acpigen_emit_byte(ctx, DUAL_NAME_PREFIX);
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acpigen_emit_simple_namestring(ctx, name);
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acpigen_emit_simple_namestring(ctx, &name[dotpos + 1]);
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}
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static void acpigen_emit_multi_namestring(struct acpi_ctx *ctx,
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const char *name)
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{
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unsigned char *pathlen;
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int count = 0;
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acpigen_emit_byte(ctx, MULTI_NAME_PREFIX);
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pathlen = ctx->current;
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acpigen_emit_byte(ctx, 0);
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while (*name) {
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acpigen_emit_simple_namestring(ctx, name);
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/* find end or next entity */
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while (*name != '.' && *name)
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name++;
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/* forward to next */
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if (*name == '.')
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name++;
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count++;
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}
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*pathlen = count;
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}
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void acpigen_emit_namestring(struct acpi_ctx *ctx, const char *namepath)
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{
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int dotcount;
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int dotpos;
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int i;
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/* We can start with a '\' */
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if (*namepath == '\\') {
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acpigen_emit_byte(ctx, '\\');
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namepath++;
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}
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/* And there can be any number of '^' */
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while (*namepath == '^') {
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acpigen_emit_byte(ctx, '^');
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namepath++;
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}
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for (i = 0, dotcount = 0; namepath[i]; i++) {
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if (namepath[i] == '.') {
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dotcount++;
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dotpos = i;
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}
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}
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/* If we have only \\ or only ^* then we need to add a null name */
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if (!*namepath)
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acpigen_emit_byte(ctx, ZERO_OP);
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else if (dotcount == 0)
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acpigen_emit_simple_namestring(ctx, namepath);
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else if (dotcount == 1)
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acpigen_emit_double_namestring(ctx, namepath, dotpos);
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else
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acpigen_emit_multi_namestring(ctx, namepath);
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}
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void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath)
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{
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acpigen_emit_byte(ctx, NAME_OP);
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acpigen_emit_namestring(ctx, namepath);
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}
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@ -505,3 +505,96 @@ static int dm_test_acpi_string(struct unit_test_state *uts)
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return 0;
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}
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DM_TEST(dm_test_acpi_string, 0);
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/* Test writing a name */
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static int dm_test_acpi_name(struct unit_test_state *uts)
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{
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struct acpi_ctx *ctx;
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u8 *ptr;
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ut_assertok(alloc_context(&ctx));
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ptr = acpigen_get_current(ctx);
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/*
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* The names here are made up for testing the various cases. The
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* grammar is in the ACPI spec 6.3 section 19.2.2
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*/
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acpigen_write_name(ctx, "\\_SB");
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acpigen_write_name(ctx, "\\_SB.I2C0");
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acpigen_write_name(ctx, "\\_SB.I2C0.TPM2");
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acpigen_write_name(ctx, "\\_SB.I2C0.TPM2.LONG");
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acpigen_write_name(ctx, "^^^^SPI0.FLAS");
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acpigen_write_name(ctx, "NN");
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acpigen_write_name(ctx, "^AB.CD.D.EFG");
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acpigen_write_name(ctx, "^^^^");
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acpigen_write_name(ctx, "\\");
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acpigen_write_name(ctx, "\\ABCD");
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ut_asserteq(107, acpigen_get_current(ctx) - ptr);
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq_strn("\\_SB_", (char *)ptr + 1);
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ptr += 6;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('\\', ptr[1]);
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ut_asserteq(DUAL_NAME_PREFIX, ptr[2]);
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ut_asserteq_strn("_SB_I2C0", (char *)ptr + 3);
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ptr += 11;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('\\', ptr[1]);
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ut_asserteq(MULTI_NAME_PREFIX, ptr[2]);
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ut_asserteq(3, ptr[3]);
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ut_asserteq_strn("_SB_I2C0TPM2", (char *)ptr + 4);
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ptr += 16;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('\\', ptr[1]);
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ut_asserteq(MULTI_NAME_PREFIX, ptr[2]);
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ut_asserteq(4, ptr[3]);
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ut_asserteq_strn("_SB_I2C0TPM2LONG", (char *)ptr + 4);
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ptr += 20;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('^', ptr[1]);
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ut_asserteq('^', ptr[2]);
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ut_asserteq('^', ptr[3]);
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ut_asserteq('^', ptr[4]);
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ut_asserteq(DUAL_NAME_PREFIX, ptr[5]);
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ut_asserteq_strn("SPI0FLAS", (char *)ptr + 6);
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ptr += 14;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq_strn("NN__", (char *)ptr + 1);
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ptr += 5;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('^', ptr[1]);
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ut_asserteq(MULTI_NAME_PREFIX, ptr[2]);
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ut_asserteq(4, ptr[3]);
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ut_asserteq_strn("AB__CD__D___EFG_", (char *)ptr + 4);
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ptr += 20;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('^', ptr[1]);
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ut_asserteq('^', ptr[2]);
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ut_asserteq('^', ptr[3]);
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ut_asserteq('^', ptr[4]);
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ut_asserteq(ZERO_OP, ptr[5]);
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ptr += 6;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq('\\', ptr[1]);
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ut_asserteq(ZERO_OP, ptr[2]);
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ptr += 3;
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ut_asserteq(NAME_OP, ptr[0]);
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ut_asserteq_strn("\\ABCD", (char *)ptr + 1);
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ptr += 5;
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free_context(&ctx);
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return 0;
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}
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DM_TEST(dm_test_acpi_name, 0);
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